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Method and device for preparing active carbon and byproducts of combustion gas and tar through conversion of coal in supercritical water

A technology for preparing activated carbon and supercritical water, which is applied in the field of coal chemical industry and can solve problems such as poor economy, low conversion rate, and insufficient reuse of hot steam

Active Publication Date: 2016-02-24
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2003, the Chinese patent No. 2575098Y "Supercritical Water Continuous Extraction Reaction Device for Coal" improved the device described in previous patents, added a supercritical water nozzle device, strengthened the extraction reaction process, and Using non-toxic supercritical water as the reaction medium, the reaction conditions are relatively safe and have no pollution to the environment, but there are no specific examples listed
From the point of view of the method and device for the graded and continuous conversion of low-rank coal by supercritical water, although some advantages of supercritical water have been brought into play, the conversion rate of the entire process is currently low, up to about 80%. A large amount of residual hot steam has not been fully reused, resulting in low thermal efficiency and poor process economy

Method used

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  • Method and device for preparing active carbon and byproducts of combustion gas and tar through conversion of coal in supercritical water
  • Method and device for preparing active carbon and byproducts of combustion gas and tar through conversion of coal in supercritical water
  • Method and device for preparing active carbon and byproducts of combustion gas and tar through conversion of coal in supercritical water

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Experimental program
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Embodiment 1

[0059] The reactor of the present invention includes a supercritical water reactor e, a catalytic reactor h, a coal slurry preheater d, a water preheater f, a solid collection tank k, and a supercritical water reactor outlet at the top of the supercritical water reactor e c, there is a coal slurry preheater d in the upper part of the supercritical water reactor e, the bottom of the supercritical water reactor e has a conical outlet b, and the lower part of the supercritical water reactor e has a supercritical water reactor water inlet g , the outer wall of the supercritical water reactor e is surrounded by a water preheater f, and there are two outlets at the bottom of the water preheater f, one outlet is connected to the water inlet g of the supercritical water reactor, and the other outlet is connected to the conical outlet b2 Both are connected to the solid collection tank k through the high-pressure ball valve 4, the electric furnace a heated by the supercritical water reac...

Embodiment 2

[0074] The supercritical water reactor e is a vertical reactor, the main body is cylindrical, the inner diameter of the cylinder is 50mm, and the bottom is a tapered outlet b, which is beneficial to the smooth discharge of solid products.

[0075] The supercritical water heating electric furnace a is controlled by three stages of control points a-1, a-2 and a-3, which can realize uniform and adjustable temperature. The coal slurry preheater d is a trumpet-shaped tube with a thin upper part and a thicker lower part. The inner diameter is 20mm at the thickest part. The water inlet g of the supercritical water reactor has a filter membrane, and the outlet c of the supercritical water reactor has a filter membrane with a pore size of 10 μm.

[0076] The outlet c of the supercritical water reactor at the top of the supercritical water reactor e is provided with a filter membrane, and the filter membrane aperture is 10 μm to prevent solid materials from being taken out of the reactor...

Embodiment 3

[0084] The supercritical water reactor e is a vertical reactor, the main body is cylindrical, the inner diameter of the cylinder is 10mm, and the bottom is a tapered outlet b, which is beneficial to the smooth discharge of solid products.

[0085] The supercritical water heating electric furnace a is controlled by four stages of control points a-1, a-2, a-3, and a-4, which can realize uniform and adjustable temperature. The coal slurry preheater d is a trumpet-shaped tube with a thin upper part and a thicker bottom part. The inner diameter is 5mm at the thickest part. The water inlet g of the supercritical water reactor has a filter membrane, and the outlet c of the supercritical water reactor has a filter membrane with a pore size of 1 μm.

[0086] The outlet c of the supercritical water reactor at the top of the supercritical water reactor e is provided with a filter membrane, and the filter membrane aperture is 1 μm to prevent solid materials from being taken out of the reac...

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Abstract

Provided are a method and device for preparing active carbon and byproducts of combustion gas and tar through conversion of coal in supercritical water. In the method, by utilization of characteristics of high extraction solubility and extremely strong mass and heat transferring performances of a supercritical water high-pressure environment, coal is employed as a raw material to prepare active carbon, high-heating-value gas and tar, and a technology for integration of pyrolysis, gasification and extraction of coal by utilization of supercritical water is achieved. A vertical supercritical water reactor is employed and a catalytic reactor is matched. The supercritical water reactor is mainly aimed to the extraction process and the gasification process, and the matched catalytic reactor is aimed to the methanation process. The method and device have advantages of high thermal efficiency and good economical efficiency.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a method and a device for preparing activated carbon by transforming coal in supercritical water while by-producing gas and tar. Background technique [0002] my country is rich in coal resources, especially the reserves and distribution of low-grade coal are relatively concentrated, but they are all located in remote areas. Coal coking and gasification processes provide necessary raw materials for fine chemicals and energy needs. However, as environmental problems become increasingly prominent, the clean and efficient utilization of coal is the focus of attention at present. How to improve the thermal efficiency, economic benefits and environmental benefits of the process is a The key that needs to be solved urgently. [0003] Supercritical water refers to the state of water whose temperature and pressure are respectively above the critical point (374°C, 22.1MP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/46C10J3/48C10C1/00C10L3/08C01B31/08
CPCC10C1/00C10J3/46C10J3/48C10L3/08Y02P20/52Y02P20/54
Inventor 毕继诚周娴娴曲旋张荣
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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